|Nickname|| Machida Black |
|Age|| 15/16 (start of series) |
18 (end of series)
|Education||Machida West High School|
|Relatives|| Unnamed Father |
Naoki Kuroi (brother)
|Relationships||Ran Kotobuki (Girlfriend/Future Wife)|
|Anime||Episode 1: The World's Greatest Gal ♥ Go Go → Ran Kotobuki|
|Manga||Chapter 1: The Greatest Kogal in the World|
Tatsuki is a tall teenager with Hazel eyes. Tatsuki has blonde hair that's spiked up. Tatsuki is also heavily taned.
Tatsuki is very hyper and energetic. He seemd to compliment Ran very well, being able to match her hyperactivity and energy. He is very jumpy and spontanious but he also can be serious at very few times. Tatsuki isn't very bright, sometimes being even more dumb then Ran.
Tatsuki is introduced upon his arrival in Shibuya. He meets Ran after criticizing her Parapara skills. The two wind up hanging out and everyone in town hears about it, assuming the two are dating. This leads to another confrontation between Mami and Ran. After another duel between then, which leads to another loss by Mami, Tatsuki asks Ran to be his girlfriend and she accepts. The two then become a very goofy couple but they both really care for each other. However overtime, Tatsuki questions weather or not he is really okay as Ran's boyfriend as Ran has trouble expressing her feelings. However his confidence is boosted when Ran confronts him. After the series ends, he and Ran get married and have 3 children together.